Long time relationships problem

Well, I’m with my boyfriend for 5 years, we have been living together the last 3. We were never the couple to have sex every day and all that because the sex wasn’t great at the beginning (he was a virgin when we started seeing each other) but then I begun to teach him how I liked it and encourage him to look up some tips and read about the subject a bit and he got pretty good. We were doing it very often, almost every day, and it was awesome because he likes to please me and see me come, so I orgasm almost every time. But the thing is in the last few months (8 or so) we slowed things down a lot. Sometimes we didn’t have any relations for like 2 weeks. I know sometimes is my fault, I say some bullshit excuse because I’m really not in the mood or really tired or just being lazy and not feeling like doing any effort but sometimes I see he’s doing the same. I don’t know what happened to us It’s like we don’t turn each other on any more. The problem is that I really love him and want us to have a family together, he’s loving, caring, responsible, thank goodness not the jealous type.. what do I do? Should I get some toys and light this thing up or just forget it and let it pass (could be a very annoying fase)? I want to save this but don’t know if I should, maybe this is life telling us it’s time to move on or smt... IDK... but our only problems are sex and money (we’re only 23 so our jobs really suck) so I really think we’re good together. I really need some help. What should I do?

(Sorry for the writing mistakes guys, I’m from Brasil and don’t use English very often)